CV Savers are a double layer of protection over the Cv Joint boot. The hard rubber CV Boot can be easily damaged, allowing dirt to get into the cv joint seals, and also lets the grease out of that cv joint and all over your vehicle. The expense and hassle of replacing your cv boot can be avoided with SealSavers CV Savers. These CV Boot Savers are inexpensive and can be installed in minutes. Made from a durable “FlexPower” material, CV Savers make a great first line of defense over the cv joint boot. The flexible material will move around with the cv joint and will not cause a loss in the range of motion. You can leave them on full time as a cv joint protector or use them as needed when you notice a hole in the cv boot and you need a cv boot cover.